Browsing Dept. of Electrical and Electronics Engineering - Ph.D. / Sc.D. by Title
Now showing items 1-20 of 168
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3D electron density estimation in the ionosphere by using IRI-Plas model and GPS measurements
(Bilkent University, 2016-05)Three dimensional imaging of the electron density distribution in the ionosphere is a crucial task for investigating the ionospheric effects. Dual-frequency Global Positioning System (GPS) satellite signals can be used ... -
Ablation cooled material removal with bursts of ultrafast pulses
(Bilkent University, 2016-01)Material processing with femto-second pulses allows precise and non-thermal material removal and being widely used in scientific, medical and industrial applications. However, due to low ablation speed at which material ... -
Accurate and efficient solutions of electromagnetic problems with the multilevel fast multipole algorithm
(Bilkent University, 2009)The multilevel fast multipole algorithm (MLFMA) is a powerful method for the fast and efficient solution of electromagnetics problems discretized with large numbers of unknowns. This method reduces the complexity of ... -
Activity recognition invariant to position and orientation of wearable motion sensor units
(Bilkent University, 2019-04)We propose techniques that achieve invariance to the placement of wearable motion sensor units in the context of human activity recognition. First, we focus on invariance to sensor unit orientation and develop three ... -
Adaptive observer designs for friction estimation in position control of simple mechanical systems with time delay
(Bilkent University, 2021-09)Friction force/torque is a well known natural effect that can cause performance degradation or even instability in mechanical systems, although it sometimes can be disregarded in closed loop feedback design phase. Hence, ... -
Airborne cmut cell design
(Bilkent University, 2014)All transducers used in airborne ultrasonic applications, including capacitive micromachined ultrasonic transducers (CMUTs), incorporate loss mechanisms to have reasonably wide frequency bandwidth. However, CMUTs can yield ... -
Alternative approaches and noise benefits in hypothesis-testing problems in the presence of partial information
(Bilkent University, 2011)Performance of some suboptimal detectors can be enhanced by adding independent noise to their observations. In the first part of the dissertation, the effects of additive noise are studied according to the restricted ... -
Analysis and control of periodic gaits in legged robots
(Bilkent University, 2017-11)The analysis, identi cation and control of legged locomotion have been an interest for various researchers towards building legged robots that move like the animals do in nature. The extensive studies on understanding ... -
Analysis and design of switching and fuzzy systems
(Bilkent University, 2002-09)In this thesis we consider the controller design problems for switching and fuzzy systems. In switching systems, the system dynamics and/or control input take dierent forms in different parts of the underlying state space. ... -
Analysis of current induction on thin conductors inside the body during MRI scan
(Bilkent University, 2014)The aim of this thesis is to develop a method to analyze currents on thin conductor structures inside the body during Magnetic Resonance Imaging (MRI) scan based on Modified Transmission Line Method (MoTLiM). In this ... -
Analysis of cylindrical reflector antennas in the presence of circular radomes by complex source-dual series approach
(Bilkent University, 1996)The radiation from cylindrical reflector antennas is analyzed in an accurate manner for both H and E polarization cases. The problem is first formulated in terms of the dual series equations and then it is regularized ... -
Analysis of Gaussian-beam pumped optical parametric amplifiers for the generation of squeezed states of light
(Bilkent University, 2002) -
An analytical model of IEEE 80211 DCF for multi-hop wireless networks and its application to goodput and energy analysis
(Bilkent University, 2010)In this thesis, we present an analytical model for the IEEE 802.11 DCF in multihop networks that considers hidden terminals and works for a large range of traffic loads. A goodput model which considers rate reduction due ... -
Anomaly detection in diverse sensor networks using machine learning
(Bilkent University, 2022-01)Earthquake precursor detection is one of the oldest research areas that has the potential of saving human lives. Recent studies have enlightened the fact that strong seismic activities and earthquakes affect the electron ... -
Antenna analysis
(Bilkent University, 2009)Multiple-input-multiple-output (MIMO) wireless communication systems have been attracting huge interest, since a boost in the data rate was shown to be possible, using multiple antennas both at the transmitter and receiver. ... -
Applications of electromagnetic phenomena in periodic structures
(Bilkent University, 2012) -
Broadband GaN LNA MMIC development with the micro/nano process development by kink-effect in S22 consideration
(Bilkent University, 2021-01)Broadband low noise amplifiers (LNA) are one of the key components of the nu-merous applications such as communication, electronic warfare, and radar. The requirements for higher bandwidth, higher speed, higher survivability, ... -
Calculation of scalar optical diffraction field from its distributed samples over the space
(Bilkent University, 2010)As a three-dimensional viewing technique, holography provides successful threedimensional perceptions. The technique is based on duplication of the information carrying optical waves which come from an object. Therefore, ... -
Cancer imaging and treatment monitoring with color magnetic particle imaging
(Bilkent University, 2021-09)Magnetic particle imaging (MPI) is emerging as a highly promising non-invasive tomographic imaging modality for cancer research. Superparamagnetic iron oxide nanoparticles (SPIONs) are used as imaging tracers in MPI. By ... -
Circuit theoretical methods for efficient solution of finite element structural mechanics problems
(Bilkent University, 1999)Shrinking device dimensions in integrated circuit technology made integrated circuits with millions of components a reality. As a result of this advance, electrical circuit simulators that can handle very large number ...
